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Spillover is a well-known phenomenon in heterogeneous catalysis and is involved in many important reactions. The establishment of the spillover concept opened up a new research field for an in-depth understanding of the dynamic behavior of migrated species on a catalyst surface. However, a comprehensive understanding of spillover remains lacking. In recent years, the development of advanced characterization techniques in combination with well-controlled synthesis methodologies has provided us with increasing worthwhile information about spillover. This Review mainly describes recent progress on the characterization and mechanism of hydrogen spillover and how to effectively utilize the spillover effect for enhanced catalytic performance. Additionally, the challenges remaining in this research area are discussed, and possible research directions for the future are proposed.
Xiong et al. (Wed,) studied this question.